Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540e85d17ae428a…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 01:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c8413d1e56e315d9f185259615d5f07f SHA-1: e54112b69fd4d6db0a04246d22122ec0359d606c SHA-256: 7540e85d17ae428a672c0080dfd606f0f276b14d7247ea3ed80dbaa63ef1a784
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to 'free Robux' and 'game hacks' to entice users. It contains multiple embedded URLs that point to known malicious redirectors and other PDF files hosted on external domains, indicating a phishing or scam campaign. The ML classifier also flagged this PDF as malicious, supporting the observed malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/free-robux-for-videos-game-hack In PDF document text
    • https://gigbagwinkel.nl/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/roblox-twisted-murderer-cheat-engine_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/pubg-uc-uae_GM1330123889.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/roblox-robux-hack-2021-pc_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7D 25220 bytes
SHA-256: 10d3b972cf4ddaaf509dbff592217add1496e07b7133062b947fd11cb49ef8e0
font_01_sfnt_off00008a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A34 3016 bytes
SHA-256: 4c3e2db5174821787a4569c9da4979555510caebd15fb9cea35573c139e242bd
font_02_sfnt_off00009498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9498 18444 bytes
SHA-256: 1ec21ed17295e3d49cd7a507c4ef3ee968e538ae560c82d8bcc555326bed268a

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